/* roulang page: index */
:root {
      --deep-steel: #2C3E50;
      --warm-copper: #C49A6C;
      --copper-hover: #B3875D;
      --bg-light: #F8F9FA;
      --card-white: #FFFFFF;
      --text-dark: #1E1E1E;
      --text-muted: #6C757D;
      --border-light: #E9ECEF;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 28px rgba(0,0,0,0.10);
      --radius-md: 12px;
      --radius-btn: 8px;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      padding-top: 0;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 600;
    }
    h1 {
      font-size: 3rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }
    h2 {
      font-size: 2rem;
      line-height: 1.3;
      margin-bottom: 1rem;
    }
    h3 {
      font-size: 1.4rem;
      font-weight: 500;
      line-height: 1.4;
    }
    .section-title {
      color: var(--deep-steel);
      position: relative;
      display: inline-block;
      margin-bottom: 2.5rem;
    }
    .section-title:after {
      content: '';
      position: absolute;
      bottom: -10px;
      left: 0;
      width: 60px;
      height: 3px;
      background: var(--warm-copper);
      border-radius: 3px;
    }
    .text-muted-custom {
      color: var(--text-muted);
      font-size: 0.95rem;
    }
    .btn-primary-custom {
      background-color: var(--warm-copper);
      border: 2px solid var(--warm-copper);
      color: white;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.7rem 2rem;
      transition: all 0.3s ease;
      font-size: 1rem;
      letter-spacing: 0.5px;
      box-shadow: 0 4px 10px rgba(196,154,108,0.25);
    }
    .btn-primary-custom:hover {
      background-color: var(--copper-hover);
      border-color: var(--copper-hover);
      color: white;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(179,135,93,0.35);
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--deep-steel);
      color: var(--deep-steel);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.7rem 2rem;
      transition: all 0.3s ease;
      font-size: 1rem;
    }
    .btn-outline-custom:hover {
      background-color: var(--deep-steel);
      color: white;
      border-color: var(--deep-steel);
      transform: translateY(-2px);
    }
    .card-custom {
      background: var(--card-white);
      border: none;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      padding: 2rem 1.8rem;
      height: 100%;
      border: 1px solid var(--border-light);
    }
    .card-custom:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 64px;
      height: 64px;
      background: rgba(196,154,108,0.12);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--warm-copper);
      font-size: 28px;
      margin-bottom: 1.5rem;
    }
    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1050;
      background: rgba(255,255,255,0.75);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(0,0,0,0.05);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      transition: all 0.3s ease;
    }
    #header.scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 4px 18px rgba(0,0,0,0.08);
    }
    .navbar {
      padding: 0.8rem 0;
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--deep-steel) !important;
      letter-spacing: 1px;
      font-family: var(--font-heading);
    }
    .nav-link {
      color: var(--text-dark) !important;
      font-weight: 500;
      margin: 0 0.5rem;
      transition: 0.2s;
      position: relative;
    }
    .nav-link:after {
      content: '';
      position: absolute;
      width: 0;
      height: 2px;
      bottom: 0;
      left: 0;
      background: var(--warm-copper);
      transition: width 0.25s ease;
    }
    .nav-link:hover:after,
    .nav-link.active:after {
      width: 100%;
    }
    .nav-link:hover {
      color: var(--warm-copper) !important;
    }
    .navbar-toggler {
      border: none;
    }
    /* Hero */
    #hero {
      background: linear-gradient(102deg, rgba(44,62,80,0.05) 0%, rgba(196,154,108,0.08) 100%);
      padding: 8rem 0 5rem;
      min-height: 85vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-content h1 {
      color: var(--deep-steel);
    }
    .hero-img {
      max-width: 100%;
      border-radius: 24px;
      box-shadow: 0 25px 50px -12px rgba(0,0,0,0.15);
    }
    /* 统计数字 */
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--deep-steel);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--text-muted);
      font-size: 1rem;
    }
    /* 证言卡片 */
    .testimonial-card {
      background: white;
      border-radius: 20px;
      padding: 2rem;
      box-shadow: var(--shadow-card);
      position: relative;
      border: 1px solid var(--border-light);
    }
    .testimonial-card .quote-icon {
      font-size: 2.5rem;
      color: rgba(196,154,108,0.5);
      position: absolute;
      top: 10px;
      left: 20px;
    }
    .avatar-img {
      width: 70px;
      height: 70px;
      border-radius: 50%;
      object-fit: cover;
      border: 3px solid var(--warm-copper);
    }
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: transparent;
      color: var(--warm-copper);
      box-shadow: none;
      font-weight: 600;
    }
    .accordion-button:focus {
      border-color: var(--deep-steel);
      box-shadow: 0 0 0 3px rgba(44,62,80,0.15);
    }
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }
    /* CTA */
    #cta {
      background: linear-gradient(rgba(44,62,80,0.88), rgba(44,62,80,0.92)), url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
      background-attachment: fixed;
    }
    footer {
      background: var(--deep-steel);
      color: rgba(255,255,255,0.8);
    }
    footer a {
      color: rgba(255,255,255,0.75);
      text-decoration: none;
      transition: 0.2s;
    }
    footer a:hover {
      color: var(--warm-copper);
    }
    @media (max-width: 768px) {
      h1 { font-size: 2.2rem; }
      h2 { font-size: 1.8rem; }
      #hero { padding: 6rem 0 3rem; text-align: center; }
      .navbar-collapse { background: rgba(255,255,255,0.98); padding: 1rem; border-radius: 12px; margin-top: 0.5rem; }
    }